228418631 has 4 divisors (see below), whose sum is σ = 261049872. Its totient is φ = 195787392.

The previous prime is 228418609. The next prime is 228418643. The reversal of 228418631 is 136814822.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 228418631 - 2²⁶ = 161309767 is a prime.

It is a super-2 number, since 2×228418631² = 104350141975828322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 228418591 and 228418600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228418661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16315610 + ... + 16315623.

It is an arithmetic number, because the mean of its divisors is an integer number (65262468).

Almost surely, 2^228418631 is an apocalyptic number.

228418631 is a deficient number, since it is larger than the sum of its proper divisors (32631241).

228418631 is an equidigital number, since it uses as much as digits as its factorization.

228418631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32631240.

The product of its digits is 18432, while the sum is 35.

The square root of 228418631 is about 15113.5247708799. The cubic root of 228418631 is about 611.2851441884.

The spelling of 228418631 in words is "two hundred twenty-eight million, four hundred eighteen thousand, six hundred thirty-one".